Analysis

  • max time kernel
    147s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    09/01/2023, 09:56

General

  • Target
    file.exe
  • Size 279KB
  • Sample230109-lyck4adg66
  • SHA256 520f40cfaf815bae4d5373deddcaa04e919f38f30b28eb08fb19a6fa6bff4241
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • Detects Smokeloader packer 1 IoCs
  • SmokeLoader

    Modular backdoor trojan in use since 2014.

  • Blocklisted process makes network request 3 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 1 IoCs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Suspicious use of SetThreadContext 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Program crash 1 IoCs
  • Checks SCSI registry key(s) 3 TTPs 3 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Checks processor information in registry 2 TTPs 26 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Modifies Internet Explorer settings 1 TTPs 4 IoCs
  • Modifies registry class 30 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious behavior: MapViewOfSection 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 14 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks SCSI registry key(s)
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious behavior: MapViewOfSection
    PID:4236
  • C:\Users\Admin\AppData\Local\Temp\CD67.exe
    C:\Users\Admin\AppData\Local\Temp\CD67.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of WriteProcessMemory
    PID:2952
    • C:\Windows\SysWOW64\rundll32.exe
      "C:\Windows\system32\rundll32.exe" "C:\Users\Admin\AppData\Local\Temp\Wtfoiq.tmp",Iyidwoiowsw
      2⤵
      • Blocklisted process makes network request
      • Loads dropped DLL
      • Suspicious use of SetThreadContext
      • Checks processor information in registry
      • Suspicious use of WriteProcessMemory
      PID:1008
      • C:\Windows\system32\rundll32.exe
        "C:\Windows\system32\rundll32.exe" "C:\Windows\system32\shell32.dll",#61 15570
        3⤵
        • Modifies registry class
        • Suspicious use of FindShellTrayWindow
        PID:4348
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2952 -s 556
      2⤵
      • Program crash
      PID:4560
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 2952 -ip 2952
    1⤵
      PID:2284
    • C:\Windows\System32\rundll32.exe
      C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
      1⤵
        PID:1872
      • C:\Windows\SysWOW64\svchost.exe
        C:\Windows\SysWOW64\svchost.exe -k LocalService
        1⤵
          PID:4544

        Network

              MITRE ATT&CK Enterprise v6

              Replay Monitor

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              Downloads

              Accessibility.dll

              • Path C:\Program Files (x86)\WindowsPowerShell\Modules\Accessibility.dll
              • Size 714KB
              • SHA256 fb13408919d269621c78164c8c4cf29ea5e750c209d4c6a0d014967b8442b364
              • MD5 SHA1 SHA512 SSDEEP

              Rwdfud.tmp

              • Path C:\ProgramData\{B7E8E476-349D-60AA-651B-798B40E3CAEC}\Rwdfud.tmp
              • Size 3.4MB
              • SHA256 2c928ac3329628c20f6c85b515fe0f9955739aac2c7b5ad4abbbb6efb7c4a26f
              • MD5 SHA1 SHA512 SSDEEP

              CD67.exe

              • Path C:\Users\Admin\AppData\Local\Temp\CD67.exe
              • Size 1.0MB
              • SHA256 64a7eb6bb893da24b6af8e00c58a4934b74c6941e58c4573d6e882ea9d1207c6
              • MD5 SHA1 SHA512 SSDEEP

              CD67.exe

              • Path C:\Users\Admin\AppData\Local\Temp\CD67.exe
              • Size 1.0MB
              • SHA256 64a7eb6bb893da24b6af8e00c58a4934b74c6941e58c4573d6e882ea9d1207c6
              • MD5 SHA1 SHA512 SSDEEP

              Wtfoiq.tmp

              • Path C:\Users\Admin\AppData\Local\Temp\Wtfoiq.tmp
              • Size 714KB
              • SHA256 d0ac0e9021c6e231c60256198309b7f72ce4c5e772cf343b5456c2ce0664b9bd
              • MD5 SHA1 SHA512 SSDEEP

              Wtfoiq.tmp

              • Path C:\Users\Admin\AppData\Local\Temp\Wtfoiq.tmp
              • Size 714KB
              • SHA256 d0ac0e9021c6e231c60256198309b7f72ce4c5e772cf343b5456c2ce0664b9bd
              • MD5 SHA1 SHA512 SSDEEP

              accessibility.dll

              • Path \??\c:\program files (x86)\windowspowershell\modules\accessibility.dll
              • Size 714KB
              • SHA256 fb13408919d269621c78164c8c4cf29ea5e750c209d4c6a0d014967b8442b364
              • MD5 SHA1 SHA512 SSDEEP

              memory/1008-147-0x0000000004BE0000-0x0000000004D20000-memory.dmp

              memory/1008-151-0x0000000004BE0000-0x0000000004D20000-memory.dmp

              memory/1008-159-0x00000000051E0000-0x0000000005D21000-memory.dmp

              memory/1008-152-0x0000000004BE0000-0x0000000004D20000-memory.dmp

              memory/1008-150-0x0000000004BE0000-0x0000000004D20000-memory.dmp

              memory/1008-146-0x00000000051E0000-0x0000000005D21000-memory.dmp

              memory/1008-149-0x0000000004BE0000-0x0000000004D20000-memory.dmp

              memory/1008-148-0x0000000004BE0000-0x0000000004D20000-memory.dmp

              memory/2952-144-0x0000000000400000-0x00000000030C7000-memory.dmp

              memory/2952-143-0x0000000004E60000-0x0000000004F75000-memory.dmp

              memory/2952-142-0x0000000004D7D000-0x0000000004E51000-memory.dmp

              memory/4236-133-0x0000000003160000-0x0000000003169000-memory.dmp

              memory/4236-134-0x0000000000400000-0x0000000003008000-memory.dmp

              memory/4236-132-0x00000000031CD000-0x00000000031E3000-memory.dmp

              memory/4236-135-0x0000000000400000-0x0000000003008000-memory.dmp

              memory/4348-156-0x00000281D66B0000-0x00000281D67F0000-memory.dmp

              memory/4348-158-0x00000281D4DE0000-0x00000281D5092000-memory.dmp

              memory/4348-155-0x00000000008D0000-0x0000000000B71000-memory.dmp

              memory/4348-157-0x00000281D4DE0000-0x00000281D5092000-memory.dmp

              memory/4348-154-0x00000281D66B0000-0x00000281D67F0000-memory.dmp